Cognomen Gasyn (Gasyn 
, Гасин 
) , in all the world, is a rare last name. The surname Gasyn is habitual in Eastern Europe, particularly Ukraine, where it is a rare surname, Belarus, and Russia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Russia, Ukraine, and Germany. Very seldom, Gasyn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gasyn | Poland, Germany |
| Гасин | Ukraine, Belarus, Kazakhstan, Russia |